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That's the .minecraft folder. 🙂 The original poster wants the world save folder (or a subfolder within it): Path mySubfolder = serverLevel.getServer().getWorldPath(LevelResource.ROOT).normalise().toAbsolutePath().resolve("mysubfolder");

update from 1.16 to 1.18: instructions above work line-for-line, with no semantic changes. the dialect has changed however. in addition to common changes (level instead of world, etc.), here's a list of things you need to change that are related to making and registering a simple entity: instead of Biome.Category.SWAMP write Biome.BiomeCategory.SWAMP instead of EntityClassification.CREATURE write MobCategory.CREATURE instead of MobSpawnInfo.Spawners write MobSpawnSettings.SpawnerData instead of EntityPredicate use TargetingConditions instead of DataParameter/EntityDataManager/DataSerializers write EntityDataAccessor/SynchedEntityData/EntityDataSerializers instead of IParticleData write ParticleOptions instead of AttributeModifierMap.MutableAttribute write AttributeSupplier.Builder instead of SpawnReason write MobSpawnType instead of ILivingEntityData write SpawnGroupData instead of MovementController write MoveControl instead of WorldEntitySpawner write NaturalSpawner instead of EntitySpawnPlacementRegistry.PlacementType write SpawnPlacements.Type instead of RenderingRegistry.registerEntityRenderingHandler write EntityRenderers.register